The
point chart can change each year, but **approximately**, the total number of points in the chart cannot change. So if points are added somewhere, they need to be taken away somewhere else. This is on a resort basis (point increase at AKV cannot be offset by cheaper rooms at RIV.) The number of seasons, what those seasons are, and relative cost of those seasons can change, but there are some limitations (10% I think?) on the amount of change for a specific date year to year. Disney also has some incentive not to reduce the cost of any season too much if they've sold fixed weeks for that season, since the owners of the FW are locked in at the point cost they agreed to in the contract and Disney has to provide any points to make up the difference. This seems to be most relevant in early December.
Point charts were originally created based on the cost of cash rooms at that resort. This is why some of the older resorts have cheaper point charts.
In actuality (with the exception of CFW, which I haven't taken the time to fully understand) we don't own points, we own a percentage of a resort, and should be able to stay at that resort for a certain amount of time. What we own, and how many nights we can book each year at our home resort, shoudln't change. You may see some minor changes year to year in total points in a point chart as the number of weekends vary year to year, or if a holiday falls on a weekday. Leap years also have an whole extra day.